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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e6e759964a2194981777a8f5e51ad4af38486268188b5d38c0489fb22741ee' 
  AND token = '/OBP4WM8NZbF1Tl7roiQeKNU/nr9u6ZEMWUX5Uc5zp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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