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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '694230b4b08614e2eb113d4df28c7d7cf990059b1636071226fad677e1ed6807' 
  AND token = 'f8fS9oTDMrB//cjRdoUUeH9YZN6E5ZXc56MEIqf2ylI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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