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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2952be7acc40c25b1dde5a6109435c4b4d52a9802916c5eb03e4d47d2fd0f47d' 
  AND token = 'lEE1tRswToKI1cMipu0YsNe6JB/DgoTkiJzUho/Az10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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