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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d58e73522dccee31b5e700aa5f98316c19e718ae0e52406772d9093703930b9' 
  AND token = 'o6c0zURleJeN6kd2coz8eux08iXE8+X97OmDcBaez9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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