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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99916347cc432cb2f31ed57d8898916659230c73b95f70ce49c0c5368169d791' 
  AND token = '0x/vCQYUr94HHvczNTqD+Nxl4vyrROVyho7z8fJivqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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