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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085f2c75d11424f070723bb0a52ad6a12d244ef92a2372aa0eb088819b83a1b4' 
  AND token = '8rOdW7S0WyQoyuO2apMxo6QkeLj5tNHKnfE62jlW/lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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