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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '953e98fbf7f836eafcddcda8186b1929675c94f4034394a9190fd30d26fffe2b' 
  AND token = 'UF1tBCaDq5tHiL9HVt7WLBUkDqziAe4T7jtkFq7A7MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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