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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dceee8bd837ac60fc50e6b620d023ca478848d4b73a11e8ee6e5ab9310507e23' 
  AND token = 'CW7DYbCnfe6AqX03AY89K0tLM1txHLSWUmV/fz9zrX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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