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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6658f16e86d6bcaf64ff76b87d8a0e0919f31e2d0eba6d1a7c35018c05b2dc0' 
  AND token = 'dM8XGTptdhquqHGaG59laEVChxKQH/0ohAdzLnsOt6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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