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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8df7a4cc6abdaa1fa517f895e460e269207db733b37eeae47086602d242101e8' 
  AND token = 'ZoVsQwzAHi1QzEYbgaUei6M4r/oxiMLokmDC+O9oHK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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