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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9391c3698a8d42d37dd7b54b3e57528d9019bc9c2f934f4e3c0fbc059364b7e2' 
  AND token = 'P1LdZ9M6K94qw0uqiHq9dTQ1Flrs9n1V3FBJpO/4RjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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