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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e8865615524484a06bb42758aa80b17b3f555ecf89226f392a9beb104b26b48' 
  AND token = 'rsApPE00XJShA9nSEVVkD/MX7hMm53fRf5cs32v2y+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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