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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be01369107c61c0aad376232567b4a047f96a422c0c4d75a8334855a5ef254be' 
  AND token = 'ju4titd5NvQUCPA1PQ7uUOeHAm2A9QdncPd2YsX1B2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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