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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b6a9243946493a50db555c8685ab885a56f96fbefc40b310ff91970525494d2' 
  AND token = 'ridDqZ5axGO1dbaEZybDJrUlDYVfcM9A4qK9VCmCMac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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