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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40177e93fadd8ca05aa33766531b6b82a777aad6446823d81c3c2df4d793b419' 
  AND token = 'AnvCuAfVqWiw0N3xEQ93/NeMXWm5i+WkUS1vqP7rQNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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