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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64a6b19491f3fcf912c5764f09302c30526b7aeb1a5b76f85eb58aadf5d46ec1' 
  AND token = 'hD8QvZZg0nLCp+IqKnrX2JRgeaCXEmse2r/ete5gEyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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