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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '394b839929dd2f7221398e0e3cfec707f42d6788bf7c92388d6098eaa7053c9d' 
  AND token = 'C+DFfbZ8vYCCfpL+ks052sp+uSqzzH2vl9tE7a3m7JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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