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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c1a5a6339257cb8f3976e0d2722687ee49d780ea8d0b0ff3ec751b1c0f647f' 
  AND token = 'BSihrIY8/un+eA10fA95O0Pct0ohH8Gj1tGV5eun1AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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