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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f32fb1dfc35c82351cde649b2825953af6f1cbbe602cbba469ee7d56ead0725' 
  AND token = 'b63Y2rGM8Mi1V40d+KnqIijmDUJ6DYzdtH23iO9ufNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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