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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a5fe979f7f6336bd5a9457fc6983761e8e021b481fe87930e32bbd4e38c3c3' 
  AND token = 'axB5hbx3yFB8+w2TnXe7dLyAYN6g+eLtxO3X+wctW+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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