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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f7d88423e310c9bfac2c26a5e37fb7333b1687a5ce3ed5dcef9c593f576c1e' 
  AND token = 'SBl8gmJdpvuE4cbd5978FfuKsi8ASKHi8VrLKbA4FcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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