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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deadbcf573fbb94c3102f0c960d03637211e26cc5a3933f123b88f8f8a992d59' 
  AND token = 'Ay+p0mS4QVsmtACW27DFM0UAqAMC7+Ljg3NNdEqB+U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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