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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9fa98b39d7081397fc2d8cd347c494d4725db5d234b60b5ebaef25f6d9a739a' 
  AND token = 'iB8/9xRY5mRqVdKtZYlYpqqHdm8Q5HNE4xpb9Q3fRnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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