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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0e0ee2d0a8f153dd7aee684aafb033559de2337195182731257fa9188a963ff' 
  AND token = 'uxolJiBoY5UkZUl3/4GpPpCpSFizdGGqfQnawa6ACjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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