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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5efe3f1f2265d53b5dea0c978414b9582d5c0e4c04139911ea7136a7b4dc7ca6' 
  AND token = 'EJCXy4LJRfKLsjgb8x+J5T8ibWMU8qlhYUjAiePwl1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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