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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '862fc978a213fc4fd2ae8d39e7d0ee59af2639ebfaf6e57c2a6d29ade9957dd6' 
  AND token = 'zGUFEH4odkwZs1wf3lQZkC9j28LyHQ8NMpxLSn9WBuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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