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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9923a6e642a869a15abb83576cb9b98b48c0da67d5c6edc806c449edcf50f01' 
  AND token = 'bLuY3gznY6V3y26pc7+wRwt8nc3Hp6f2zTW4LD0c6HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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