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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e59d2ccef1c3dc5090a81f29b91cc69dd4798205291968de397e0b84c9b431d' 
  AND token = 'BTEFVO6Gt7+Sv+DmdP2Mfr5QURfyYLGmneayi/PfELg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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