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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca38e2626b7b2f76dd1dc98e047da99076dec43d6a4f3d3450af6cc25f680e55' 
  AND token = 'x54xvONPT/f97ZXtoUCGxVgVyPEvycAGLn1fv8VNIRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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