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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1505c7ff975c6e46b3bba06de0af15576f98b98b77f0ddaa39852317f46048f' 
  AND token = 'DEwprU1/P3KWi1NKuM+6v7maEH5W2/D6ozPj1l77zcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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