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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc4fd5e61ce6335eb73d534d9e19f85a6ba845a891cfbcca4e6917e8836fab11' 
  AND token = 'R1MsdTANvI796ITFlbOiVU0Omlg5UdL0V9vD914wJno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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