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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '286a183c12781399035e028d6743cfcd401fb0ba1ba0b64c616f94180420c7e7' 
  AND token = 'bTtt4uF+G1S/83wrbYRa+dM/8Z7HcAXW/6iTpmuZeZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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