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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c13500a2e025abd31c67e4c790493c96a3b70c7022ae8fd49580004f2944f6' 
  AND token = '4n1QuHT4sXkklwmSBV5VaLS88W3FbbXgZ3IvRPfHV3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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