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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd796cc31587b9db5c066bc34cc4faf8f673159291408e3762418609cf291f67d' 
  AND token = 'EOxtke87i7mdtKLlPXX3/d/skJs8eHu5yA8uq6cxnno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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