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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e71e37fb0b7ac75205be14c2bce7f61ec03049e8540ca8ffda5ce03fce0c7b9' 
  AND token = 'lFTaGJ+ZHI1DobfmMB0jyODZE+Y6J1lBklUTjto+5HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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