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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acf785a0212966e8e4b7fab635d3205ae6f7065a1e9165522aecd1c296449ba0' 
  AND token = 'Mj/LduuUR0fOFol0IgR74HNGQD03FgsbEyh0WzjuwLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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