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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de0b62bd7da623b4f7c77422da7dd8cf43db1721dd5d5fc1bf9c709781a45c74' 
  AND token = 'bV/kh6WztlDsH3ORm08vfsHIAthJK0s5VAagnOHwu8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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