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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a6331da8fac2c067547753b52c77d8db90d9d1d6b48b4625649847549ab0fb3' 
  AND token = 'zkCwyfE3pljTlTbD6biJbf0kYsui3R3AnvbeB8W4Sk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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