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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c58cdda6fb67fb7bcd6502683bc45dd336ce15ea884709fd48781b5a4ef74ef' 
  AND token = 'OXo/n1iOxgozQO6UgJ23ZmH3/SvbxjVhMbaPHKStcts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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