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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c48d28d70c081da1b2b6f02cd904025b20dbedad3065c6541be21ba45a6b55' 
  AND token = 'NTfBOQyFbPA/1hzOJgmziHKH5AsDnc5Le72Ha3+7AEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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