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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '383ad5ea6bd24a09292d1e3acbe77b962c0cad0ae99c1132c76011cebe38b8a0' 
  AND token = 'bw+saQK86Uqkfi1Rw7Z4TZWKnlWg3R3cEnZqJ64p8U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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