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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f19f34bc6f668750a361a72725bd19077bb34cb971bf964a341602ab0f363250' 
  AND token = 'nA9Y6MDm3Yr/WuxxGM7keiPPNtlWO8I1MhQGlg01C98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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