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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef6f415ed2a8b81956ead0ce338ddcfd7cfd0c5a12275408cce7292baecbb92' 
  AND token = 'cj273Y1GeL6/BvGL7FQhrk8wpy+a9xVoOYkL+4PCPx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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