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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c317ad0f1618448a5bfe31c01f8aaac88197b2918ea6b4f73db37a803b24e0da' 
  AND token = '7x13m3sje77puXPunKoUKKU1IQ8is//Ft/6VlcJ+w3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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