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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6007bfe1a686a75b2f5865d7fbbcff8ceff2a4daa9aef2398dc15a268095a8e' 
  AND token = 'o969S/iWVgPtzWyi6hJ0a1eKA/9jsNZ6RQXtLkYpn2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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