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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b716700d02d16a9891388dd33db7c6d9d77495ae961ab517dd8a51c12bcaf6e2' 
  AND token = 'aKbHa2VsYdrx4cc2ZcIcn9SPLDids7Zr74x8ndW0wF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00154

JSON explain

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