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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0fedd1bd7660b80cb2e3fe04ab53c7c605b110edf073875a6c02bd40e0892a1' 
  AND token = 'G7XitEjOzKDZ3D46OpM3SAll9cl6tVIqBoZ8/foj76U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}