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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '097a8db26055a656f42e361f84ff36a2debdab4dce685c3201a7fb9cebac97a6' 
  AND token = 'DvgA6ko2AK1zEGQZnxVi2wxAMxFGqH+gS1Jkixkx+bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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