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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f22b5f4293a4830b5b72c3b904c88d398a8a56ebb1fbaa73e59ca75e86e82494' 
  AND token = 'q3fN83JB2A386R6zI8A/BR2N2o/5qb4+zKUTcmkGgzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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