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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c19af196510b8d793a718a66155f48274e576d21382c89c60fc15545a4ecb0' 
  AND token = 'R6uj12/9VkdvH0fsVGZGvkFmcgTKxf1fVafPIAe+58c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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