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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a3f82e9ebbfed6fbc5dfe2d5e91a28da2417fbd4747515e8cbe036919fa86c' 
  AND token = 'QWaw6WRLAu7DiGdmtm07+8Tp1oL7bGrOT0YvA0yvfos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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