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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c35b6c25be9850e136c07ebc3dea133b4a5497a0794b246e9b2a8f20aab97d' 
  AND token = 'MzC0AW1n8cmU74FoxY+lI2pDPPfKuwwqow2aVb8/5IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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