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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c0c455923bcff4f73ad93e29bd81ccd8ea0dd22fa850f43996ec43501feb1c5' 
  AND token = 'rPLsQEv+LBBce1iWiyUr9uVgXGbRQ4nXeSJw6n9aeKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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