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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f64b70e871e6a9ee41e8e752105441e3f0a396f852c14948ec7313449e43253' 
  AND token = 'epYR7dFC1PE0wmLH3wA71MME66zFGO2gCXOvS07KXQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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