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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea8f23285cab72a17edd9644595458304af5b3e774351fc3088d85c7961fde34' 
  AND token = 'od5k7Z4ms4mra2cjy1G5djsu6JdalCcXbiu2CpYsD5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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