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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83168061497022e129f0a69388126622a8566091994a57ee2760cdf3019b9dea' 
  AND token = 'G9d2ulDjwCKwPQz9/EgQsfCKfDTpXG+W4tVLIQ3Ndis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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