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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cae280ec8088773c0c744124e404460339b749dd458080ee4ff6ff172a33dcc' 
  AND token = 'zNerVJqNvu1W/fAiO3X2+htEKP+od13EyJu6B6A9ynI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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