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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3529cb70f2982556113f3ed64330450cabf22bee82b330702725e42247a1507' 
  AND token = 'i4PWTK+ZgoF1kqzfe3eRUZyYu25Sc1ZVRf6zPlRHCOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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