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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5456ffd50dc6b85413818e8cf9bf98e3a212a3be74bf34dad9e0b12456e19c47' 
  AND token = 'E8KorKO3yOWhJhNsbkd+48RP0EBnqoQHeu/bQdQZHXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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